<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>

        <textarea placeholder="请输入要评论的内容(最多吐槽120字)" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">
            发表评论
        </mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="item in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户:{{item.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                    {{ item.content === 'undefined' ? '此用户很懒，嘛都没说！':item.content}}
                </div>
            </div>

        </div>

        <mt-button type="danger" size="large" plain @click="getMore">
            加载更多
        </mt-button>
    </div>
</template>

<script>
    import {Toast} from "mint-ui"
export default {
    data() {
        return {
            pageIndex: 1,  //默认展示第一页数据
            comments: [],
            msg: '' //评论输入的内容
        }
    },
    created() {
        this.getComments();
    },
    methods: {
        getComments() {
            this.$http.get("api/getcomments/"+this.id+"?pageindex="+this.pageIndex).then(result => {
                if(result.body.status === 0){
                    // this.commnets = result.body.message;
                    this.comments = this.comments.concat(result.body.message)
                }else {
                    Toast("获取评论失败")
                }
            })
        },
        getMore() {  //加载更多
            this.pageIndex++;
            this.getComments();
        },
        postComment() {
            //校验是否空内容
            if( this.msg.trim().length === 0 ) {
                return Toast("评论内容不能为空")
            }
            //发表评论
            //参数1：请求的URL地址
            //参数2：提交给服务器的数据对象 { content: this.msg }
            //参数3：定义提交时候，表单中数据的格式 { emulateJSON:true }
            this.$http
                .post("api/postcomment/" + this.$route.params.id, {
                    content: this.msg.trim()
                })
                .then(function (result) {
                    if(result.body.status === 0) {
                        //拼接出一个对象
                        var cmt = {
                           user_name: "匿名用户",
                           add_time: Date.now(),
                           content: this.msg.trim()
                        };
                        this.comments.unshift(cmt);
                        this.msg = "";
                    }
                });
        }
    },
    props: ["id"]
}
</script>


<style lang="scss" scoped>
    .cmt-container {
        h3 {
            font-size: 18px;
        }
        .textarea {
            font-size: 14px;
            height: 85px;
            margin: 0;
        }
        .cmt-list {
            margin: 5px 0;
            .cmt-item {
                font-size: 13px;
                .cmt-title {
                    line-height: 30px;
                    background-color: #ccc;

                }
                .cmt-body {
                    line-height: 35px;
                    text-indent: 2em;
                }
            }
        }
    }
</style>